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Finding the Fourth Proportional to 1,070.79, 1,605.49 and 421.59

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Solution

The fourth proportional to 1,070.79, 1,605.49 and 421.59 is: 632.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.79 : 1,605.49 = 421.59 : x
  2. Step 2: Convert to fraction form
    1,070.79/1,605.49 = 421.59/x
  3. Step 3: Cross multiply
    1,070.79x = 1,605.49 × 421.59
  4. Step 4: Simplify right side
    1,070.79x = 676,858.53
  5. Step 5: Solve for x
    x = 676,858.53/1,070.79
  6. Step 6: Final answer
    x = 632.11

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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.