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Finding the Fourth Proportional to 5,705.39, 7,890.93 and 5,115.71

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Solution

The fourth proportional to 5,705.39, 7,890.93 and 5,115.71 is: 7,075.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,705.39 : 7,890.93 = 5,115.71 : x
  2. Step 2: Convert to fraction form
    5,705.39/7,890.93 = 5,115.71/x
  3. Step 3: Cross multiply
    5,705.39x = 7,890.93 × 5,115.71
  4. Step 4: Simplify right side
    5,705.39x = 40,367,670.06
  5. Step 5: Solve for x
    x = 40,367,670.06/5,705.39
  6. Step 6: Final answer
    x = 7,075.36

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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.