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Finding the Fourth Proportional to 138,516.60, 207,774.90 and 45,031.80

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Solution

The fourth proportional to 138,516.60, 207,774.90 and 45,031.80 is: 67,547.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,516.60 : 207,774.90 = 45,031.80 : x
  2. Step 2: Convert to fraction form
    138,516.60/207,774.90 = 45,031.80/x
  3. Step 3: Cross multiply
    138,516.60x = 207,774.90 × 45,031.80
  4. Step 4: Simplify right side
    138,516.60x = 9,356,477,741.82
  5. Step 5: Solve for x
    x = 9,356,477,741.82/138,516.60
  6. Step 6: Final answer
    x = 67,547.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.