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Finding the Fourth Proportional to 690.47, 1,035.77 and 279.95

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Solution

The fourth proportional to 690.47, 1,035.77 and 279.95 is: 419.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.47 : 1,035.77 = 279.95 : x
  2. Step 2: Convert to fraction form
    690.47/1,035.77 = 279.95/x
  3. Step 3: Cross multiply
    690.47x = 1,035.77 × 279.95
  4. Step 4: Simplify right side
    690.47x = 289,962.41
  5. Step 5: Solve for x
    x = 289,962.41/690.47
  6. Step 6: Final answer
    x = 419.95

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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.