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Finding the Fourth Proportional to 390,826.60, 586,124.70 and 154,090.60

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Solution

The fourth proportional to 390,826.60, 586,124.70 and 154,090.60 is: 231,090.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,826.60 : 586,124.70 = 154,090.60 : x
  2. Step 2: Convert to fraction form
    390,826.60/586,124.70 = 154,090.60/x
  3. Step 3: Cross multiply
    390,826.60x = 586,124.70 × 154,090.60
  4. Step 4: Simplify right side
    390,826.60x = 90,316,306,697.82
  5. Step 5: Solve for x
    x = 90,316,306,697.82/390,826.60
  6. Step 6: Final answer
    x = 231,090.48

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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.