Home / 7,278.40-10,921.65-3,117.70

Finding the Fourth Proportional to 7,278.40, 10,921.65 and 3,117.70

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Solution

The fourth proportional to 7,278.40, 10,921.65 and 3,117.70 is: 4,678.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,278.40 : 10,921.65 = 3,117.70 : x
  2. Step 2: Convert to fraction form
    7,278.40/10,921.65 = 3,117.70/x
  3. Step 3: Cross multiply
    7,278.40x = 10,921.65 × 3,117.70
  4. Step 4: Simplify right side
    7,278.40x = 34,050,428.21
  5. Step 5: Solve for x
    x = 34,050,428.21/7,278.40
  6. Step 6: Final answer
    x = 4,678.28

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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.