Home / 12,931.24-19,397.10-5,139.40

Finding the Fourth Proportional to 12,931.24, 19,397.10 and 5,139.40

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Solution

The fourth proportional to 12,931.24, 19,397.10 and 5,139.40 is: 7,709.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,931.24 : 19,397.10 = 5,139.40 : x
  2. Step 2: Convert to fraction form
    12,931.24/19,397.10 = 5,139.40/x
  3. Step 3: Cross multiply
    12,931.24x = 19,397.10 × 5,139.40
  4. Step 4: Simplify right side
    12,931.24x = 99,689,455.74
  5. Step 5: Solve for x
    x = 99,689,455.74/12,931.24
  6. Step 6: Final answer
    x = 7,709.20

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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.