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Finding the Fourth Proportional to 1,438.50, 1,985.13 and 817.62

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Solution

The fourth proportional to 1,438.50, 1,985.13 and 817.62 is: 1,128.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.50 : 1,985.13 = 817.62 : x
  2. Step 2: Convert to fraction form
    1,438.50/1,985.13 = 817.62/x
  3. Step 3: Cross multiply
    1,438.50x = 1,985.13 × 817.62
  4. Step 4: Simplify right side
    1,438.50x = 1,623,081.99
  5. Step 5: Solve for x
    x = 1,623,081.99/1,438.50
  6. Step 6: Final answer
    x = 1,128.32

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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.