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Finding the Fourth Proportional to 145,987.20, 218,980.80 and 83,606.40

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Solution

The fourth proportional to 145,987.20, 218,980.80 and 83,606.40 is: 125,409.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,987.20 : 218,980.80 = 83,606.40 : x
  2. Step 2: Convert to fraction form
    145,987.20/218,980.80 = 83,606.40/x
  3. Step 3: Cross multiply
    145,987.20x = 218,980.80 × 83,606.40
  4. Step 4: Simplify right side
    145,987.20x = 18,308,196,357.12
  5. Step 5: Solve for x
    x = 18,308,196,357.12/145,987.20
  6. Step 6: Final answer
    x = 125,409.60

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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.