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Finding the Fourth Proportional to 1,315.80, 1,973.74 and 438.32

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Solution

The fourth proportional to 1,315.80, 1,973.74 and 438.32 is: 657.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.80 : 1,973.74 = 438.32 : x
  2. Step 2: Convert to fraction form
    1,315.80/1,973.74 = 438.32/x
  3. Step 3: Cross multiply
    1,315.80x = 1,973.74 × 438.32
  4. Step 4: Simplify right side
    1,315.80x = 865,129.72
  5. Step 5: Solve for x
    x = 865,129.72/1,315.80
  6. Step 6: Final answer
    x = 657.49

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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.