Home / 1,315.62-1,973.50-438.06

Finding the Fourth Proportional to 1,315.62, 1,973.50 and 438.06

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Solution

The fourth proportional to 1,315.62, 1,973.50 and 438.06 is: 657.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.62 : 1,973.50 = 438.06 : x
  2. Step 2: Convert to fraction form
    1,315.62/1,973.50 = 438.06/x
  3. Step 3: Cross multiply
    1,315.62x = 1,973.50 × 438.06
  4. Step 4: Simplify right side
    1,315.62x = 864,511.41
  5. Step 5: Solve for x
    x = 864,511.41/1,315.62
  6. Step 6: Final answer
    x = 657.11

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Double scale
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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.