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Finding the Fourth Proportional to 65,478.78, 90,388.71 and 45,402.12

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Solution

The fourth proportional to 65,478.78, 90,388.71 and 45,402.12 is: 62,674.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,478.78 : 90,388.71 = 45,402.12 : x
  2. Step 2: Convert to fraction form
    65,478.78/90,388.71 = 45,402.12/x
  3. Step 3: Cross multiply
    65,478.78x = 90,388.71 × 45,402.12
  4. Step 4: Simplify right side
    65,478.78x = 4,103,839,058.07
  5. Step 5: Solve for x
    x = 4,103,839,058.07/65,478.78
  6. Step 6: Final answer
    x = 62,674.34

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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.