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Finding the Fourth Proportional to 290,088.81, 435,122.28 and 79,721.28

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Solution

The fourth proportional to 290,088.81, 435,122.28 and 79,721.28 is: 119,578.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,088.81 : 435,122.28 = 79,721.28 : x
  2. Step 2: Convert to fraction form
    290,088.81/435,122.28 = 79,721.28/x
  3. Step 3: Cross multiply
    290,088.81x = 435,122.28 × 79,721.28
  4. Step 4: Simplify right side
    290,088.81x = 34,688,505,118.12
  5. Step 5: Solve for x
    x = 34,688,505,118.12/290,088.81
  6. Step 6: Final answer
    x = 119,578.91

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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.