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Finding the Fourth Proportional to 12,985.60, 17,920.32 and 7,396.48

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Solution

The fourth proportional to 12,985.60, 17,920.32 and 7,396.48 is: 10,207.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.60 : 17,920.32 = 7,396.48 : x
  2. Step 2: Convert to fraction form
    12,985.60/17,920.32 = 7,396.48/x
  3. Step 3: Cross multiply
    12,985.60x = 17,920.32 × 7,396.48
  4. Step 4: Simplify right side
    12,985.60x = 132,547,288.47
  5. Step 5: Solve for x
    x = 132,547,288.47/12,985.60
  6. Step 6: Final answer
    x = 10,207.25

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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.