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Finding the Fourth Proportional to 98,431.40, 135,788.10 and 64,424.92

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Solution

The fourth proportional to 98,431.40, 135,788.10 and 64,424.92 is: 88,875.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,431.40 : 135,788.10 = 64,424.92 : x
  2. Step 2: Convert to fraction form
    98,431.40/135,788.10 = 64,424.92/x
  3. Step 3: Cross multiply
    98,431.40x = 135,788.10 × 64,424.92
  4. Step 4: Simplify right side
    98,431.40x = 8,748,137,152.99
  5. Step 5: Solve for x
    x = 8,748,137,152.99/98,431.40
  6. Step 6: Final answer
    x = 88,875.47

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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.