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Finding the Fourth Proportional to 128,348.50, 177,116.70 and 70,986.91

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Solution

The fourth proportional to 128,348.50, 177,116.70 and 70,986.91 is: 97,959.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,348.50 : 177,116.70 = 70,986.91 : x
  2. Step 2: Convert to fraction form
    128,348.50/177,116.70 = 70,986.91/x
  3. Step 3: Cross multiply
    128,348.50x = 177,116.70 × 70,986.91
  4. Step 4: Simplify right side
    128,348.50x = 12,572,967,242.40
  5. Step 5: Solve for x
    x = 12,572,967,242.40/128,348.50
  6. Step 6: Final answer
    x = 97,959.60

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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.