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Finding the Fourth Proportional to 85,980.30, 128,970.45 and 57,986.70

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Solution

The fourth proportional to 85,980.30, 128,970.45 and 57,986.70 is: 86,980.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,980.30 : 128,970.45 = 57,986.70 : x
  2. Step 2: Convert to fraction form
    85,980.30/128,970.45 = 57,986.70/x
  3. Step 3: Cross multiply
    85,980.30x = 128,970.45 × 57,986.70
  4. Step 4: Simplify right side
    85,980.30x = 7,478,570,793.02
  5. Step 5: Solve for x
    x = 7,478,570,793.02/85,980.30
  6. Step 6: Final answer
    x = 86,980.05

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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.