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Finding the Fourth Proportional to 1,312.20, 1,980.45 and 1,312.20

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Solution

The fourth proportional to 1,312.20, 1,980.45 and 1,312.20 is: 1,980.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.20 : 1,980.45 = 1,312.20 : x
  2. Step 2: Convert to fraction form
    1,312.20/1,980.45 = 1,312.20/x
  3. Step 3: Cross multiply
    1,312.20x = 1,980.45 × 1,312.20
  4. Step 4: Simplify right side
    1,312.20x = 2,598,746.49
  5. Step 5: Solve for x
    x = 2,598,746.49/1,312.20
  6. Step 6: Final answer
    x = 1,980.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.