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Finding the Fourth Proportional to 65,489.73, 90,386.75 and 38,638.89

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Solution

The fourth proportional to 65,489.73, 90,386.75 and 38,638.89 is: 53,328.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,489.73 : 90,386.75 = 38,638.89 : x
  2. Step 2: Convert to fraction form
    65,489.73/90,386.75 = 38,638.89/x
  3. Step 3: Cross multiply
    65,489.73x = 90,386.75 × 38,638.89
  4. Step 4: Simplify right side
    65,489.73x = 3,492,443,690.71
  5. Step 5: Solve for x
    x = 3,492,443,690.71/65,489.73
  6. Step 6: Final answer
    x = 53,328.11

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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.