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Finding the Fourth Proportional to 877.32, 1,316.30 and 421

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Solution

The fourth proportional to 877.32, 1,316.30 and 421 is: 631.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.32 : 1,316.30 = 421 : x
  2. Step 2: Convert to fraction form
    877.32/1,316.30 = 421/x
  3. Step 3: Cross multiply
    877.32x = 1,316.30 × 421
  4. Step 4: Simplify right side
    877.32x = 554,162.30
  5. Step 5: Solve for x
    x = 554,162.30/877.32
  6. Step 6: Final answer
    x = 631.65

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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.