Home / 128,739.72-177,651.04-72,140.16

Finding the Fourth Proportional to 128,739.72, 177,651.04 and 72,140.16

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Solution

The fourth proportional to 128,739.72, 177,651.04 and 72,140.16 is: 99,547.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,739.72 : 177,651.04 = 72,140.16 : x
  2. Step 2: Convert to fraction form
    128,739.72/177,651.04 = 72,140.16/x
  3. Step 3: Cross multiply
    128,739.72x = 177,651.04 × 72,140.16
  4. Step 4: Simplify right side
    128,739.72x = 12,815,774,449.77
  5. Step 5: Solve for x
    x = 12,815,774,449.77/128,739.72
  6. Step 6: Final answer
    x = 99,547.94

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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.