Home / 4,985.20-7,478.22-1,287.40

Finding the Fourth Proportional to 4,985.20, 7,478.22 and 1,287.40

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Solution

The fourth proportional to 4,985.20, 7,478.22 and 1,287.40 is: 1,931.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,985.20 : 7,478.22 = 1,287.40 : x
  2. Step 2: Convert to fraction form
    4,985.20/7,478.22 = 1,287.40/x
  3. Step 3: Cross multiply
    4,985.20x = 7,478.22 × 1,287.40
  4. Step 4: Simplify right side
    4,985.20x = 9,627,460.43
  5. Step 5: Solve for x
    x = 9,627,460.43/4,985.20
  6. Step 6: Final answer
    x = 1,931.21

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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.