Home / 12,854.20-19,281.30-7,929.40

Finding the Fourth Proportional to 12,854.20, 19,281.30 and 7,929.40

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Solution

The fourth proportional to 12,854.20, 19,281.30 and 7,929.40 is: 11,894.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,854.20 : 19,281.30 = 7,929.40 : x
  2. Step 2: Convert to fraction form
    12,854.20/19,281.30 = 7,929.40/x
  3. Step 3: Cross multiply
    12,854.20x = 19,281.30 × 7,929.40
  4. Step 4: Simplify right side
    12,854.20x = 152,889,140.22
  5. Step 5: Solve for x
    x = 152,889,140.22/12,854.20
  6. Step 6: Final answer
    x = 11,894.10

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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.