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Finding the Fourth Proportional to 261,385.60, 392,078.40 and 103,532.80

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Solution

The fourth proportional to 261,385.60, 392,078.40 and 103,532.80 is: 155,299.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,385.60 : 392,078.40 = 103,532.80 : x
  2. Step 2: Convert to fraction form
    261,385.60/392,078.40 = 103,532.80/x
  3. Step 3: Cross multiply
    261,385.60x = 392,078.40 × 103,532.80
  4. Step 4: Simplify right side
    261,385.60x = 40,592,974,571.52
  5. Step 5: Solve for x
    x = 40,592,974,571.52/261,385.60
  6. Step 6: Final answer
    x = 155,299.20

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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.