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Finding the Fourth Proportional to 690.41, 1,030.29 and 616.50

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Solution

The fourth proportional to 690.41, 1,030.29 and 616.50 is: 920.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.41 : 1,030.29 = 616.50 : x
  2. Step 2: Convert to fraction form
    690.41/1,030.29 = 616.50/x
  3. Step 3: Cross multiply
    690.41x = 1,030.29 × 616.50
  4. Step 4: Simplify right side
    690.41x = 635,173.79
  5. Step 5: Solve for x
    x = 635,173.79/690.41
  6. Step 6: Final answer
    x = 920.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.