Home / 13,140.12-18,128.70-7,547.88

Finding the Fourth Proportional to 13,140.12, 18,128.70 and 7,547.88

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Solution

The fourth proportional to 13,140.12, 18,128.70 and 7,547.88 is: 10,413.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.12 : 18,128.70 = 7,547.88 : x
  2. Step 2: Convert to fraction form
    13,140.12/18,128.70 = 7,547.88/x
  3. Step 3: Cross multiply
    13,140.12x = 18,128.70 × 7,547.88
  4. Step 4: Simplify right side
    13,140.12x = 136,833,252.16
  5. Step 5: Solve for x
    x = 136,833,252.16/13,140.12
  6. Step 6: Final answer
    x = 10,413.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.