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Finding the Fourth Proportional to 660,429.20, 990,643.80 and 344,812.70

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Solution

The fourth proportional to 660,429.20, 990,643.80 and 344,812.70 is: 517,219.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,429.20 : 990,643.80 = 344,812.70 : x
  2. Step 2: Convert to fraction form
    660,429.20/990,643.80 = 344,812.70/x
  3. Step 3: Cross multiply
    660,429.20x = 990,643.80 × 344,812.70
  4. Step 4: Simplify right side
    660,429.20x = 341,586,563,416.26
  5. Step 5: Solve for x
    x = 341,586,563,416.26/660,429.20
  6. Step 6: Final answer
    x = 517,219.05

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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.