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Finding the Fourth Proportional to 713.84, 1,070.40 and 421.58

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Solution

The fourth proportional to 713.84, 1,070.40 and 421.58 is: 632.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.84 : 1,070.40 = 421.58 : x
  2. Step 2: Convert to fraction form
    713.84/1,070.40 = 421.58/x
  3. Step 3: Cross multiply
    713.84x = 1,070.40 × 421.58
  4. Step 4: Simplify right side
    713.84x = 451,259.23
  5. Step 5: Solve for x
    x = 451,259.23/713.84
  6. Step 6: Final answer
    x = 632.16

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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.