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Finding the Fourth Proportional to 65,491.48, 90,389.16 and 38,640.64

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Solution

The fourth proportional to 65,491.48, 90,389.16 and 38,640.64 is: 53,330.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,491.48 : 90,389.16 = 38,640.64 : x
  2. Step 2: Convert to fraction form
    65,491.48/90,389.16 = 38,640.64/x
  3. Step 3: Cross multiply
    65,491.48x = 90,389.16 × 38,640.64
  4. Step 4: Simplify right side
    65,491.48x = 3,492,694,991.46
  5. Step 5: Solve for x
    x = 3,492,694,991.46/65,491.48
  6. Step 6: Final answer
    x = 53,330.52

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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.