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Finding the Fourth Proportional to 710.26, 1,065.40 and 421.50

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Solution

The fourth proportional to 710.26, 1,065.40 and 421.50 is: 632.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.26 : 1,065.40 = 421.50 : x
  2. Step 2: Convert to fraction form
    710.26/1,065.40 = 421.50/x
  3. Step 3: Cross multiply
    710.26x = 1,065.40 × 421.50
  4. Step 4: Simplify right side
    710.26x = 449,066.10
  5. Step 5: Solve for x
    x = 449,066.10/710.26
  6. Step 6: Final answer
    x = 632.26

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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.