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Finding the Fourth Proportional to 1,315.53, 1,815.40 and 718.04

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Solution

The fourth proportional to 1,315.53, 1,815.40 and 718.04 is: 990.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.53 : 1,815.40 = 718.04 : x
  2. Step 2: Convert to fraction form
    1,315.53/1,815.40 = 718.04/x
  3. Step 3: Cross multiply
    1,315.53x = 1,815.40 × 718.04
  4. Step 4: Simplify right side
    1,315.53x = 1,303,529.82
  5. Step 5: Solve for x
    x = 1,303,529.82/1,315.53
  6. Step 6: Final answer
    x = 990.88

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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.