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Finding the Fourth Proportional to 280,549.10, 420,823.65 and 80,851.70

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Solution

The fourth proportional to 280,549.10, 420,823.65 and 80,851.70 is: 121,277.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,549.10 : 420,823.65 = 80,851.70 : x
  2. Step 2: Convert to fraction form
    280,549.10/420,823.65 = 80,851.70/x
  3. Step 3: Cross multiply
    280,549.10x = 420,823.65 × 80,851.70
  4. Step 4: Simplify right side
    280,549.10x = 34,024,307,502.71
  5. Step 5: Solve for x
    x = 34,024,307,502.71/280,549.10
  6. Step 6: Final answer
    x = 121,277.55

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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.