Home / 1,312.20-1,812.57-972.21

Finding the Fourth Proportional to 1,312.20, 1,812.57 and 972.21

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Solution

The fourth proportional to 1,312.20, 1,812.57 and 972.21 is: 1,342.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.20 : 1,812.57 = 972.21 : x
  2. Step 2: Convert to fraction form
    1,312.20/1,812.57 = 972.21/x
  3. Step 3: Cross multiply
    1,312.20x = 1,812.57 × 972.21
  4. Step 4: Simplify right side
    1,312.20x = 1,762,203.64
  5. Step 5: Solve for x
    x = 1,762,203.64/1,312.20
  6. Step 6: Final answer
    x = 1,342.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.