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Finding the Fourth Proportional to 860.04, 1,289.97 and 339.93

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Solution

The fourth proportional to 860.04, 1,289.97 and 339.93 is: 509.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.04 : 1,289.97 = 339.93 : x
  2. Step 2: Convert to fraction form
    860.04/1,289.97 = 339.93/x
  3. Step 3: Cross multiply
    860.04x = 1,289.97 × 339.93
  4. Step 4: Simplify right side
    860.04x = 438,499.50
  5. Step 5: Solve for x
    x = 438,499.50/860.04
  6. Step 6: Final answer
    x = 509.86

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Double scale
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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.