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Finding the Fourth Proportional to 284,488.61, 392,589.59 and 155,422.80

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Solution

The fourth proportional to 284,488.61, 392,589.59 and 155,422.80 is: 214,480.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    284,488.61 : 392,589.59 = 155,422.80 : x
  2. Step 2: Convert to fraction form
    284,488.61/392,589.59 = 155,422.80/x
  3. Step 3: Cross multiply
    284,488.61x = 392,589.59 × 155,422.80
  4. Step 4: Simplify right side
    284,488.61x = 61,017,372,551.54
  5. Step 5: Solve for x
    x = 61,017,372,551.54/284,488.61
  6. Step 6: Final answer
    x = 214,480.90

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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.