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Finding the Fourth Proportional to 171,980.80, 257,971.20 and 129,990.40

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Solution

The fourth proportional to 171,980.80, 257,971.20 and 129,990.40 is: 194,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,980.80 : 257,971.20 = 129,990.40 : x
  2. Step 2: Convert to fraction form
    171,980.80/257,971.20 = 129,990.40/x
  3. Step 3: Cross multiply
    171,980.80x = 257,971.20 × 129,990.40
  4. Step 4: Simplify right side
    171,980.80x = 33,533,779,476.48
  5. Step 5: Solve for x
    x = 33,533,779,476.48/171,980.80
  6. Step 6: Final answer
    x = 194,985.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.