Home / 128,547.20-192,739.80-53,719.40

Finding the Fourth Proportional to 128,547.20, 192,739.80 and 53,719.40

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Solution

The fourth proportional to 128,547.20, 192,739.80 and 53,719.40 is: 80,545.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,547.20 : 192,739.80 = 53,719.40 : x
  2. Step 2: Convert to fraction form
    128,547.20/192,739.80 = 53,719.40/x
  3. Step 3: Cross multiply
    128,547.20x = 192,739.80 × 53,719.40
  4. Step 4: Simplify right side
    128,547.20x = 10,353,866,412.12
  5. Step 5: Solve for x
    x = 10,353,866,412.12/128,547.20
  6. Step 6: Final answer
    x = 80,545.25

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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.