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Finding the Fourth Proportional to 257,492.68, 386,345.67 and 139,024.78

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Solution

The fourth proportional to 257,492.68, 386,345.67 and 139,024.78 is: 208,594.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,492.68 : 386,345.67 = 139,024.78 : x
  2. Step 2: Convert to fraction form
    257,492.68/386,345.67 = 139,024.78/x
  3. Step 3: Cross multiply
    257,492.68x = 386,345.67 × 139,024.78
  4. Step 4: Simplify right side
    257,492.68x = 53,711,621,775.70
  5. Step 5: Solve for x
    x = 53,711,621,775.70/257,492.68
  6. Step 6: Final answer
    x = 208,594.75

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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.