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Finding the Fourth Proportional to 78,457.83, 117,686.20 and 25,871.55

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Solution

The fourth proportional to 78,457.83, 117,686.20 and 25,871.55 is: 38,807.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,457.83 : 117,686.20 = 25,871.55 : x
  2. Step 2: Convert to fraction form
    78,457.83/117,686.20 = 25,871.55/x
  3. Step 3: Cross multiply
    78,457.83x = 117,686.20 × 25,871.55
  4. Step 4: Simplify right side
    78,457.83x = 3,044,724,407.61
  5. Step 5: Solve for x
    x = 3,044,724,407.61/78,457.83
  6. Step 6: Final answer
    x = 38,807.15

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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.