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Finding the Fourth Proportional to 90,670, 136,009.88 and 28,345.36

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Solution

The fourth proportional to 90,670, 136,009.88 and 28,345.36 is: 42,519.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,670 : 136,009.88 = 28,345.36 : x
  2. Step 2: Convert to fraction form
    90,670/136,009.88 = 28,345.36/x
  3. Step 3: Cross multiply
    90,670x = 136,009.88 × 28,345.36
  4. Step 4: Simplify right side
    90,670x = 3,855,249,012.16
  5. Step 5: Solve for x
    x = 3,855,249,012.16/90,670
  6. Step 6: Final answer
    x = 42,519.57

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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.