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Finding the Fourth Proportional to 743.48, 1,026.01 and 428.75

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Solution

The fourth proportional to 743.48, 1,026.01 and 428.75 is: 591.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.48 : 1,026.01 = 428.75 : x
  2. Step 2: Convert to fraction form
    743.48/1,026.01 = 428.75/x
  3. Step 3: Cross multiply
    743.48x = 1,026.01 × 428.75
  4. Step 4: Simplify right side
    743.48x = 439,901.79
  5. Step 5: Solve for x
    x = 439,901.79/743.48
  6. Step 6: Final answer
    x = 591.68

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Double scale
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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.