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Finding the Fourth Proportional to 78,715.48, 108,624.21 and 42,904.74

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Solution

The fourth proportional to 78,715.48, 108,624.21 and 42,904.74 is: 59,206.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,715.48 : 108,624.21 = 42,904.74 : x
  2. Step 2: Convert to fraction form
    78,715.48/108,624.21 = 42,904.74/x
  3. Step 3: Cross multiply
    78,715.48x = 108,624.21 × 42,904.74
  4. Step 4: Simplify right side
    78,715.48x = 4,660,493,487.76
  5. Step 5: Solve for x
    x = 4,660,493,487.76/78,715.48
  6. Step 6: Final answer
    x = 59,206.82

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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.