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Finding the Fourth Proportional to 762.40, 1,051.80 and 605.06

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Solution

The fourth proportional to 762.40, 1,051.80 and 605.06 is: 834.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.40 : 1,051.80 = 605.06 : x
  2. Step 2: Convert to fraction form
    762.40/1,051.80 = 605.06/x
  3. Step 3: Cross multiply
    762.40x = 1,051.80 × 605.06
  4. Step 4: Simplify right side
    762.40x = 636,402.11
  5. Step 5: Solve for x
    x = 636,402.11/762.40
  6. Step 6: Final answer
    x = 834.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.