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Finding the Fourth Proportional to 12,386.10, 18,580.05 and 7,445.10

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Solution

The fourth proportional to 12,386.10, 18,580.05 and 7,445.10 is: 11,168.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,386.10 : 18,580.05 = 7,445.10 : x
  2. Step 2: Convert to fraction form
    12,386.10/18,580.05 = 7,445.10/x
  3. Step 3: Cross multiply
    12,386.10x = 18,580.05 × 7,445.10
  4. Step 4: Simplify right side
    12,386.10x = 138,330,330.26
  5. Step 5: Solve for x
    x = 138,330,330.26/12,386.10
  6. Step 6: Final answer
    x = 11,168.19

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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.