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Finding the Fourth Proportional to 100,553.48, 138,738.90 and 56,946.74

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Solution

The fourth proportional to 100,553.48, 138,738.90 and 56,946.74 is: 78,572.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,553.48 : 138,738.90 = 56,946.74 : x
  2. Step 2: Convert to fraction form
    100,553.48/138,738.90 = 56,946.74/x
  3. Step 3: Cross multiply
    100,553.48x = 138,738.90 × 56,946.74
  4. Step 4: Simplify right side
    100,553.48x = 7,900,728,066.19
  5. Step 5: Solve for x
    x = 7,900,728,066.19/100,553.48
  6. Step 6: Final answer
    x = 78,572.40

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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.