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Finding the Fourth Proportional to 720,756.36, 994,671.78 and 478,621.40

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Solution

The fourth proportional to 720,756.36, 994,671.78 and 478,621.40 is: 660,516.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,756.36 : 994,671.78 = 478,621.40 : x
  2. Step 2: Convert to fraction form
    720,756.36/994,671.78 = 478,621.40/x
  3. Step 3: Cross multiply
    720,756.36x = 994,671.78 × 478,621.40
  4. Step 4: Simplify right side
    720,756.36x = 476,071,199,884.09
  5. Step 5: Solve for x
    x = 476,071,199,884.09/720,756.36
  6. Step 6: Final answer
    x = 660,516.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.