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Finding the Fourth Proportional to 660,053.40, 990,080.10 and 431,730.60

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Solution

The fourth proportional to 660,053.40, 990,080.10 and 431,730.60 is: 647,595.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,053.40 : 990,080.10 = 431,730.60 : x
  2. Step 2: Convert to fraction form
    660,053.40/990,080.10 = 431,730.60/x
  3. Step 3: Cross multiply
    660,053.40x = 990,080.10 × 431,730.60
  4. Step 4: Simplify right side
    660,053.40x = 427,447,875,621.06
  5. Step 5: Solve for x
    x = 427,447,875,621.06/660,053.40
  6. Step 6: Final answer
    x = 647,595.90

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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.