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Finding the Fourth Proportional to 860.36, 1,290.54 and 347

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Solution

The fourth proportional to 860.36, 1,290.54 and 347 is: 520.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.36 : 1,290.54 = 347 : x
  2. Step 2: Convert to fraction form
    860.36/1,290.54 = 347/x
  3. Step 3: Cross multiply
    860.36x = 1,290.54 × 347
  4. Step 4: Simplify right side
    860.36x = 447,817.38
  5. Step 5: Solve for x
    x = 447,817.38/860.36
  6. Step 6: Final answer
    x = 520.50

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Half scale
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Double scale
Find fourth proportional to 861.36, 1,292.04 and 348
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.