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Finding the Fourth Proportional to 285,645.40, 428,528.02 and 85,980.40

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Solution

The fourth proportional to 285,645.40, 428,528.02 and 85,980.40 is: 128,988.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,645.40 : 428,528.02 = 85,980.40 : x
  2. Step 2: Convert to fraction form
    285,645.40/428,528.02 = 85,980.40/x
  3. Step 3: Cross multiply
    285,645.40x = 428,528.02 × 85,980.40
  4. Step 4: Simplify right side
    285,645.40x = 36,845,010,570.81
  5. Step 5: Solve for x
    x = 36,845,010,570.81/285,645.40
  6. Step 6: Final answer
    x = 128,988.64

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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.