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Finding the Fourth Proportional to 890.47, 1,228.75 and 497.53

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Solution

The fourth proportional to 890.47, 1,228.75 and 497.53 is: 686.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.47 : 1,228.75 = 497.53 : x
  2. Step 2: Convert to fraction form
    890.47/1,228.75 = 497.53/x
  3. Step 3: Cross multiply
    890.47x = 1,228.75 × 497.53
  4. Step 4: Simplify right side
    890.47x = 611,339.99
  5. Step 5: Solve for x
    x = 611,339.99/890.47
  6. Step 6: Final answer
    x = 686.54

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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.