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Finding the Fourth Proportional to 12,278.90, 18,417.54 and 5,258.90

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Solution

The fourth proportional to 12,278.90, 18,417.54 and 5,258.90 is: 7,888.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,278.90 : 18,417.54 = 5,258.90 : x
  2. Step 2: Convert to fraction form
    12,278.90/18,417.54 = 5,258.90/x
  3. Step 3: Cross multiply
    12,278.90x = 18,417.54 × 5,258.90
  4. Step 4: Simplify right side
    12,278.90x = 96,856,001.11
  5. Step 5: Solve for x
    x = 96,856,001.11/12,278.90
  6. Step 6: Final answer
    x = 7,888.00

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1.5x scale

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.