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Finding the Fourth Proportional to 740.90, 1,111.70 and 578.90

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Solution

The fourth proportional to 740.90, 1,111.70 and 578.90 is: 868.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.90 : 1,111.70 = 578.90 : x
  2. Step 2: Convert to fraction form
    740.90/1,111.70 = 578.90/x
  3. Step 3: Cross multiply
    740.90x = 1,111.70 × 578.90
  4. Step 4: Simplify right side
    740.90x = 643,559.02
  5. Step 5: Solve for x
    x = 643,559.02/740.90
  6. Step 6: Final answer
    x = 868.62

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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.