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Finding the Fourth Proportional to 500.47, 690.58 and 279.40

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Solution

The fourth proportional to 500.47, 690.58 and 279.40 is: 385.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.47 : 690.58 = 279.40 : x
  2. Step 2: Convert to fraction form
    500.47/690.58 = 279.40/x
  3. Step 3: Cross multiply
    500.47x = 690.58 × 279.40
  4. Step 4: Simplify right side
    500.47x = 192,948.05
  5. Step 5: Solve for x
    x = 192,948.05/500.47
  6. Step 6: Final answer
    x = 385.53

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1.5x scale

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.