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Finding the Fourth Proportional to 61,685.64, 85,037.04 and 40,428

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Solution

The fourth proportional to 61,685.64, 85,037.04 and 40,428 is: 55,732.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,685.64 : 85,037.04 = 40,428 : x
  2. Step 2: Convert to fraction form
    61,685.64/85,037.04 = 40,428/x
  3. Step 3: Cross multiply
    61,685.64x = 85,037.04 × 40,428
  4. Step 4: Simplify right side
    61,685.64x = 3,437,877,453.12
  5. Step 5: Solve for x
    x = 3,437,877,453.12/61,685.64
  6. Step 6: Final answer
    x = 55,732.22

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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.