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Finding the Fourth Proportional to 128,589.95, 177,792.75 and 112,628.60

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Solution

The fourth proportional to 128,589.95, 177,792.75 and 112,628.60 is: 155,724.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,589.95 : 177,792.75 = 112,628.60 : x
  2. Step 2: Convert to fraction form
    128,589.95/177,792.75 = 112,628.60/x
  3. Step 3: Cross multiply
    128,589.95x = 177,792.75 × 112,628.60
  4. Step 4: Simplify right side
    128,589.95x = 20,024,547,959.51
  5. Step 5: Solve for x
    x = 20,024,547,959.51/128,589.95
  6. Step 6: Final answer
    x = 155,724.05

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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.