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Finding the Fourth Proportional to 62,280, 85,985.28 and 39,962.88

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Solution

The fourth proportional to 62,280, 85,985.28 and 39,962.88 is: 55,173.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,280 : 85,985.28 = 39,962.88 : x
  2. Step 2: Convert to fraction form
    62,280/85,985.28 = 39,962.88/x
  3. Step 3: Cross multiply
    62,280x = 85,985.28 × 39,962.88
  4. Step 4: Simplify right side
    62,280x = 3,436,219,426.41
  5. Step 5: Solve for x
    x = 3,436,219,426.41/62,280
  6. Step 6: Final answer
    x = 55,173.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.