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Finding the Fourth Proportional to 1,341.80, 2,011.30 and 647.42

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Solution

The fourth proportional to 1,341.80, 2,011.30 and 647.42 is: 970.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,341.80 : 2,011.30 = 647.42 : x
  2. Step 2: Convert to fraction form
    1,341.80/2,011.30 = 647.42/x
  3. Step 3: Cross multiply
    1,341.80x = 2,011.30 × 647.42
  4. Step 4: Simplify right side
    1,341.80x = 1,302,155.85
  5. Step 5: Solve for x
    x = 1,302,155.85/1,341.80
  6. Step 6: Final answer
    x = 970.45

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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.