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Finding the Fourth Proportional to 1,312.99, 1,970.45 and 920.41

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Solution

The fourth proportional to 1,312.99, 1,970.45 and 920.41 is: 1,381.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.99 : 1,970.45 = 920.41 : x
  2. Step 2: Convert to fraction form
    1,312.99/1,970.45 = 920.41/x
  3. Step 3: Cross multiply
    1,312.99x = 1,970.45 × 920.41
  4. Step 4: Simplify right side
    1,312.99x = 1,813,621.88
  5. Step 5: Solve for x
    x = 1,813,621.88/1,312.99
  6. Step 6: Final answer
    x = 1,381.29

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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.