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Finding the Fourth Proportional to 78,700.76, 108,607.14 and 42,890.81

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Solution

The fourth proportional to 78,700.76, 108,607.14 and 42,890.81 is: 59,189.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,700.76 : 108,607.14 = 42,890.81 : x
  2. Step 2: Convert to fraction form
    78,700.76/108,607.14 = 42,890.81/x
  3. Step 3: Cross multiply
    78,700.76x = 108,607.14 × 42,890.81
  4. Step 4: Simplify right side
    78,700.76x = 4,658,247,663.35
  5. Step 5: Solve for x
    x = 4,658,247,663.35/78,700.76
  6. Step 6: Final answer
    x = 59,189.36

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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.