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Finding the Fourth Proportional to 1,312.95, 1,813.85 and 980.79

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Solution

The fourth proportional to 1,312.95, 1,813.85 and 980.79 is: 1,354.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.95 : 1,813.85 = 980.79 : x
  2. Step 2: Convert to fraction form
    1,312.95/1,813.85 = 980.79/x
  3. Step 3: Cross multiply
    1,312.95x = 1,813.85 × 980.79
  4. Step 4: Simplify right side
    1,312.95x = 1,779,005.94
  5. Step 5: Solve for x
    x = 1,779,005.94/1,312.95
  6. Step 6: Final answer
    x = 1,354.97

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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.