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Finding the Fourth Proportional to 290,458.66, 435,688.34 and 90,780.10

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Solution

The fourth proportional to 290,458.66, 435,688.34 and 90,780.10 is: 136,170.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,458.66 : 435,688.34 = 90,780.10 : x
  2. Step 2: Convert to fraction form
    290,458.66/435,688.34 = 90,780.10/x
  3. Step 3: Cross multiply
    290,458.66x = 435,688.34 × 90,780.10
  4. Step 4: Simplify right side
    290,458.66x = 39,551,828,441.69
  5. Step 5: Solve for x
    x = 39,551,828,441.69/290,458.66
  6. Step 6: Final answer
    x = 136,170.25

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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.