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Finding the Fourth Proportional to 420,987.66, 631,581.10 and 136,677.66

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Solution

The fourth proportional to 420,987.66, 631,581.10 and 136,677.66 is: 205,048.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,987.66 : 631,581.10 = 136,677.66 : x
  2. Step 2: Convert to fraction form
    420,987.66/631,581.10 = 136,677.66/x
  3. Step 3: Cross multiply
    420,987.66x = 631,581.10 × 136,677.66
  4. Step 4: Simplify right side
    420,987.66x = 86,323,026,848.23
  5. Step 5: Solve for x
    x = 86,323,026,848.23/420,987.66
  6. Step 6: Final answer
    x = 205,048.83

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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.