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Finding the Fourth Proportional to 1,315.77, 1,973.67 and 378.71

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Solution

The fourth proportional to 1,315.77, 1,973.67 and 378.71 is: 568.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.77 : 1,973.67 = 378.71 : x
  2. Step 2: Convert to fraction form
    1,315.77/1,973.67 = 378.71/x
  3. Step 3: Cross multiply
    1,315.77x = 1,973.67 × 378.71
  4. Step 4: Simplify right side
    1,315.77x = 747,448.57
  5. Step 5: Solve for x
    x = 747,448.57/1,315.77
  6. Step 6: Final answer
    x = 568.07

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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.