Home / 128,421.75-177,222.30-71,065.23

Finding the Fourth Proportional to 128,421.75, 177,222.30 and 71,065.23

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Solution

The fourth proportional to 128,421.75, 177,222.30 and 71,065.23 is: 98,070.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,421.75 : 177,222.30 = 71,065.23 : x
  2. Step 2: Convert to fraction form
    128,421.75/177,222.30 = 71,065.23/x
  3. Step 3: Cross multiply
    128,421.75x = 177,222.30 × 71,065.23
  4. Step 4: Simplify right side
    128,421.75x = 12,594,343,510.63
  5. Step 5: Solve for x
    x = 12,594,343,510.63/128,421.75
  6. Step 6: Final answer
    x = 98,070.18

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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.