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Finding the Fourth Proportional to 860.02, 1,289.85 and 243.70

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Solution

The fourth proportional to 860.02, 1,289.85 and 243.70 is: 365.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.02 : 1,289.85 = 243.70 : x
  2. Step 2: Convert to fraction form
    860.02/1,289.85 = 243.70/x
  3. Step 3: Cross multiply
    860.02x = 1,289.85 × 243.70
  4. Step 4: Simplify right side
    860.02x = 314,336.45
  5. Step 5: Solve for x
    x = 314,336.45/860.02
  6. Step 6: Final answer
    x = 365.50

Related Problems

Find fourth proportional to 430.01, 644.93 and 121.85
Half scale
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Double scale
Find fourth proportional to 861.02, 1,291.35 and 244.70
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.