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Finding the Fourth Proportional to 100,484.49, 138,664.99 and 56,876.10

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Solution

The fourth proportional to 100,484.49, 138,664.99 and 56,876.10 is: 78,486.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,484.49 : 138,664.99 = 56,876.10 : x
  2. Step 2: Convert to fraction form
    100,484.49/138,664.99 = 56,876.10/x
  3. Step 3: Cross multiply
    100,484.49x = 138,664.99 × 56,876.10
  4. Step 4: Simplify right side
    100,484.49x = 7,886,723,837.74
  5. Step 5: Solve for x
    x = 7,886,723,837.74/100,484.49
  6. Step 6: Final answer
    x = 78,486.98

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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.