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Finding the Fourth Proportional to 740.93, 1,111.40 and 578.75

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Solution

The fourth proportional to 740.93, 1,111.40 and 578.75 is: 868.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.93 : 1,111.40 = 578.75 : x
  2. Step 2: Convert to fraction form
    740.93/1,111.40 = 578.75/x
  3. Step 3: Cross multiply
    740.93x = 1,111.40 × 578.75
  4. Step 4: Simplify right side
    740.93x = 643,214.30
  5. Step 5: Solve for x
    x = 643,214.30/740.93
  6. Step 6: Final answer
    x = 868.12

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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.