Home / 128,258.78-177,021.47-84,574.45

Finding the Fourth Proportional to 128,258.78, 177,021.47 and 84,574.45

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Solution

The fourth proportional to 128,258.78, 177,021.47 and 84,574.45 is: 116,728.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,258.78 : 177,021.47 = 84,574.45 : x
  2. Step 2: Convert to fraction form
    128,258.78/177,021.47 = 84,574.45/x
  3. Step 3: Cross multiply
    128,258.78x = 177,021.47 × 84,574.45
  4. Step 4: Simplify right side
    128,258.78x = 14,971,492,155.46
  5. Step 5: Solve for x
    x = 14,971,492,155.46/128,258.78
  6. Step 6: Final answer
    x = 116,728.79

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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.