Home / 7,111.20-10,666.80-5,642.40

Finding the Fourth Proportional to 7,111.20, 10,666.80 and 5,642.40

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Solution

The fourth proportional to 7,111.20, 10,666.80 and 5,642.40 is: 8,463.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,111.20 : 10,666.80 = 5,642.40 : x
  2. Step 2: Convert to fraction form
    7,111.20/10,666.80 = 5,642.40/x
  3. Step 3: Cross multiply
    7,111.20x = 10,666.80 × 5,642.40
  4. Step 4: Simplify right side
    7,111.20x = 60,186,352.32
  5. Step 5: Solve for x
    x = 60,186,352.32/7,111.20
  6. Step 6: Final answer
    x = 8,463.60

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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.