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Finding the Fourth Proportional to 640,909.40, 961,291.20 and 167,642.60

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Solution

The fourth proportional to 640,909.40, 961,291.20 and 167,642.60 is: 251,444.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,909.40 : 961,291.20 = 167,642.60 : x
  2. Step 2: Convert to fraction form
    640,909.40/961,291.20 = 167,642.60/x
  3. Step 3: Cross multiply
    640,909.40x = 961,291.20 × 167,642.60
  4. Step 4: Simplify right side
    640,909.40x = 161,153,356,125.12
  5. Step 5: Solve for x
    x = 161,153,356,125.12/640,909.40
  6. Step 6: Final answer
    x = 251,444.83

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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.