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Finding the Fourth Proportional to 280,711.80, 387,377.64 and 153,384.66

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Solution

The fourth proportional to 280,711.80, 387,377.64 and 153,384.66 is: 211,668.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,711.80 : 387,377.64 = 153,384.66 : x
  2. Step 2: Convert to fraction form
    280,711.80/387,377.64 = 153,384.66/x
  3. Step 3: Cross multiply
    280,711.80x = 387,377.64 × 153,384.66
  4. Step 4: Simplify right side
    280,711.80x = 59,417,787,603.00
  5. Step 5: Solve for x
    x = 59,417,787,603.00/280,711.80
  6. Step 6: Final answer
    x = 211,668.29

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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.