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Finding the Fourth Proportional to 65,319.84, 90,039 and 42,618.76

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Solution

The fourth proportional to 65,319.84, 90,039 and 42,618.76 is: 58,747.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,319.84 : 90,039 = 42,618.76 : x
  2. Step 2: Convert to fraction form
    65,319.84/90,039 = 42,618.76/x
  3. Step 3: Cross multiply
    65,319.84x = 90,039 × 42,618.76
  4. Step 4: Simplify right side
    65,319.84x = 3,837,350,531.64
  5. Step 5: Solve for x
    x = 3,837,350,531.64/65,319.84
  6. Step 6: Final answer
    x = 58,747.09

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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.