Home / 128,420.18-177,389.18-98,574.32

Finding the Fourth Proportional to 128,420.18, 177,389.18 and 98,574.32

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Solution

The fourth proportional to 128,420.18, 177,389.18 and 98,574.32 is: 136,162.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,420.18 : 177,389.18 = 98,574.32 : x
  2. Step 2: Convert to fraction form
    128,420.18/177,389.18 = 98,574.32/x
  3. Step 3: Cross multiply
    128,420.18x = 177,389.18 × 98,574.32
  4. Step 4: Simplify right side
    128,420.18x = 17,486,017,793.86
  5. Step 5: Solve for x
    x = 17,486,017,793.86/128,420.18
  6. Step 6: Final answer
    x = 136,162.54

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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.