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Finding the Fourth Proportional to 280,752.78, 387,437.99 and 153,428.38

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Solution

The fourth proportional to 280,752.78, 387,437.99 and 153,428.38 is: 211,730.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,752.78 : 387,437.99 = 153,428.38 : x
  2. Step 2: Convert to fraction form
    280,752.78/387,437.99 = 153,428.38/x
  3. Step 3: Cross multiply
    280,752.78x = 387,437.99 × 153,428.38
  4. Step 4: Simplify right side
    280,752.78x = 59,443,981,420.42
  5. Step 5: Solve for x
    x = 59,443,981,420.42/280,752.78
  6. Step 6: Final answer
    x = 211,730.69

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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.