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Finding the Fourth Proportional to 713.30, 1,070.55 and 348.40

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Solution

The fourth proportional to 713.30, 1,070.55 and 348.40 is: 522.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.30 : 1,070.55 = 348.40 : x
  2. Step 2: Convert to fraction form
    713.30/1,070.55 = 348.40/x
  3. Step 3: Cross multiply
    713.30x = 1,070.55 × 348.40
  4. Step 4: Simplify right side
    713.30x = 372,979.62
  5. Step 5: Solve for x
    x = 372,979.62/713.30
  6. Step 6: Final answer
    x = 522.89

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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.