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Finding the Fourth Proportional to 72,718.98, 100,384.56 and 56,549.76

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Solution

The fourth proportional to 72,718.98, 100,384.56 and 56,549.76 is: 78,063.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,718.98 : 100,384.56 = 56,549.76 : x
  2. Step 2: Convert to fraction form
    72,718.98/100,384.56 = 56,549.76/x
  3. Step 3: Cross multiply
    72,718.98x = 100,384.56 × 56,549.76
  4. Step 4: Simplify right side
    72,718.98x = 5,676,722,775.71
  5. Step 5: Solve for x
    x = 5,676,722,775.71/72,718.98
  6. Step 6: Final answer
    x = 78,063.84

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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.