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Finding the Fourth Proportional to 85,597.30, 128,290.79 and 48,078.51

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Solution

The fourth proportional to 85,597.30, 128,290.79 and 48,078.51 is: 72,058.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,597.30 : 128,290.79 = 48,078.51 : x
  2. Step 2: Convert to fraction form
    85,597.30/128,290.79 = 48,078.51/x
  3. Step 3: Cross multiply
    85,597.30x = 128,290.79 × 48,078.51
  4. Step 4: Simplify right side
    85,597.30x = 6,168,029,148.08
  5. Step 5: Solve for x
    x = 6,168,029,148.08/85,597.30
  6. Step 6: Final answer
    x = 72,058.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.