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Finding the Fourth Proportional to 890.61, 1,228.55 and 691.35

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Solution

The fourth proportional to 890.61, 1,228.55 and 691.35 is: 953.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.61 : 1,228.55 = 691.35 : x
  2. Step 2: Convert to fraction form
    890.61/1,228.55 = 691.35/x
  3. Step 3: Cross multiply
    890.61x = 1,228.55 × 691.35
  4. Step 4: Simplify right side
    890.61x = 849,354.59
  5. Step 5: Solve for x
    x = 849,354.59/890.61
  6. Step 6: Final answer
    x = 953.68

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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.