Home / 10,445.20-15,667.80-7,140.40

Finding the Fourth Proportional to 10,445.20, 15,667.80 and 7,140.40

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Solution

The fourth proportional to 10,445.20, 15,667.80 and 7,140.40 is: 10,710.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,445.20 : 15,667.80 = 7,140.40 : x
  2. Step 2: Convert to fraction form
    10,445.20/15,667.80 = 7,140.40/x
  3. Step 3: Cross multiply
    10,445.20x = 15,667.80 × 7,140.40
  4. Step 4: Simplify right side
    10,445.20x = 111,874,359.12
  5. Step 5: Solve for x
    x = 111,874,359.12/10,445.20
  6. Step 6: Final answer
    x = 10,710.60

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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.