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Finding the Fourth Proportional to 1,315.40, 1,973.10 and 853.70

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Solution

The fourth proportional to 1,315.40, 1,973.10 and 853.70 is: 1,280.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.40 : 1,973.10 = 853.70 : x
  2. Step 2: Convert to fraction form
    1,315.40/1,973.10 = 853.70/x
  3. Step 3: Cross multiply
    1,315.40x = 1,973.10 × 853.70
  4. Step 4: Simplify right side
    1,315.40x = 1,684,435.47
  5. Step 5: Solve for x
    x = 1,684,435.47/1,315.40
  6. Step 6: Final answer
    x = 1,280.55

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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.