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Finding the Fourth Proportional to 1,140.86, 1,574.38 and 616.89

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Solution

The fourth proportional to 1,140.86, 1,574.38 and 616.89 is: 851.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.86 : 1,574.38 = 616.89 : x
  2. Step 2: Convert to fraction form
    1,140.86/1,574.38 = 616.89/x
  3. Step 3: Cross multiply
    1,140.86x = 1,574.38 × 616.89
  4. Step 4: Simplify right side
    1,140.86x = 971,219.79
  5. Step 5: Solve for x
    x = 971,219.79/1,140.86
  6. Step 6: Final answer
    x = 851.31

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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.