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Finding the Fourth Proportional to 426,187.80, 639,281.70 and 267,557.40

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Solution

The fourth proportional to 426,187.80, 639,281.70 and 267,557.40 is: 401,336.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,187.80 : 639,281.70 = 267,557.40 : x
  2. Step 2: Convert to fraction form
    426,187.80/639,281.70 = 267,557.40/x
  3. Step 3: Cross multiply
    426,187.80x = 639,281.70 × 267,557.40
  4. Step 4: Simplify right side
    426,187.80x = 171,044,549,519.58
  5. Step 5: Solve for x
    x = 171,044,549,519.58/426,187.80
  6. Step 6: Final answer
    x = 401,336.10

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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.