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Finding the Fourth Proportional to 280,439.61, 420,711.71 and 90,883.08

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Solution

The fourth proportional to 280,439.61, 420,711.71 and 90,883.08 is: 136,341.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,439.61 : 420,711.71 = 90,883.08 : x
  2. Step 2: Convert to fraction form
    280,439.61/420,711.71 = 90,883.08/x
  3. Step 3: Cross multiply
    280,439.61x = 420,711.71 × 90,883.08
  4. Step 4: Simplify right side
    280,439.61x = 38,235,575,542.45
  5. Step 5: Solve for x
    x = 38,235,575,542.45/280,439.61
  6. Step 6: Final answer
    x = 136,341.57

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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.