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Finding the Fourth Proportional to 828.90, 1,143.95 and 497.57

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Solution

The fourth proportional to 828.90, 1,143.95 and 497.57 is: 686.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.90 : 1,143.95 = 497.57 : x
  2. Step 2: Convert to fraction form
    828.90/1,143.95 = 497.57/x
  3. Step 3: Cross multiply
    828.90x = 1,143.95 × 497.57
  4. Step 4: Simplify right side
    828.90x = 569,186.99
  5. Step 5: Solve for x
    x = 569,186.99/828.90
  6. Step 6: Final answer
    x = 686.68

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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.