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Finding the Fourth Proportional to 128,903.91, 177,888.47 and 71,547.21

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Solution

The fourth proportional to 128,903.91, 177,888.47 and 71,547.21 is: 98,735.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,903.91 : 177,888.47 = 71,547.21 : x
  2. Step 2: Convert to fraction form
    128,903.91/177,888.47 = 71,547.21/x
  3. Step 3: Cross multiply
    128,903.91x = 177,888.47 × 71,547.21
  4. Step 4: Simplify right side
    128,903.91x = 12,727,423,361.93
  5. Step 5: Solve for x
    x = 12,727,423,361.93/128,903.91
  6. Step 6: Final answer
    x = 98,735.74

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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.