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Finding the Fourth Proportional to 19,931.40, 29,860.20 and 11,615.40

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Solution

The fourth proportional to 19,931.40, 29,860.20 and 11,615.40 is: 17,401.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,931.40 : 29,860.20 = 11,615.40 : x
  2. Step 2: Convert to fraction form
    19,931.40/29,860.20 = 11,615.40/x
  3. Step 3: Cross multiply
    19,931.40x = 29,860.20 × 11,615.40
  4. Step 4: Simplify right side
    19,931.40x = 346,838,167.08
  5. Step 5: Solve for x
    x = 346,838,167.08/19,931.40
  6. Step 6: Final answer
    x = 17,401.60

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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.