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Finding the Fourth Proportional to 5,590, 7,728.76 and 5,345.20

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Solution

The fourth proportional to 5,590, 7,728.76 and 5,345.20 is: 7,390.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,590 : 7,728.76 = 5,345.20 : x
  2. Step 2: Convert to fraction form
    5,590/7,728.76 = 5,345.20/x
  3. Step 3: Cross multiply
    5,590x = 7,728.76 × 5,345.20
  4. Step 4: Simplify right side
    5,590x = 41,311,767.95
  5. Step 5: Solve for x
    x = 41,311,767.95/5,590
  6. Step 6: Final answer
    x = 7,390.30

Related Problems

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Half scale
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Double scale
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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.