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Finding the Fourth Proportional to 2,860.47, 4,289.94 and 912.20

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Solution

The fourth proportional to 2,860.47, 4,289.94 and 912.20 is: 1,368.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,860.47 : 4,289.94 = 912.20 : x
  2. Step 2: Convert to fraction form
    2,860.47/4,289.94 = 912.20/x
  3. Step 3: Cross multiply
    2,860.47x = 4,289.94 × 912.20
  4. Step 4: Simplify right side
    2,860.47x = 3,913,261.82
  5. Step 5: Solve for x
    x = 3,913,261.82/2,860.47
  6. Step 6: Final answer
    x = 1,368.05

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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.