Home / 1,421.55-2,114.10-1,312.20

Finding the Fourth Proportional to 1,421.55, 2,114.10 and 1,312.20

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Solution

The fourth proportional to 1,421.55, 2,114.10 and 1,312.20 is: 1,951.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.55 : 2,114.10 = 1,312.20 : x
  2. Step 2: Convert to fraction form
    1,421.55/2,114.10 = 1,312.20/x
  3. Step 3: Cross multiply
    1,421.55x = 2,114.10 × 1,312.20
  4. Step 4: Simplify right side
    1,421.55x = 2,774,122.02
  5. Step 5: Solve for x
    x = 2,774,122.02/1,421.55
  6. Step 6: Final answer
    x = 1,951.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.