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Finding the Fourth Proportional to 740.43, 1,111.50 and 307.89

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Solution

The fourth proportional to 740.43, 1,111.50 and 307.89 is: 462.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.43 : 1,111.50 = 307.89 : x
  2. Step 2: Convert to fraction form
    740.43/1,111.50 = 307.89/x
  3. Step 3: Cross multiply
    740.43x = 1,111.50 × 307.89
  4. Step 4: Simplify right side
    740.43x = 342,219.74
  5. Step 5: Solve for x
    x = 342,219.74/740.43
  6. Step 6: Final answer
    x = 462.19

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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.