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Finding the Fourth Proportional to 704,981.45, 972,601.91 and 398,987.70

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Solution

The fourth proportional to 704,981.45, 972,601.91 and 398,987.70 is: 550,448.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    704,981.45 : 972,601.91 = 398,987.70 : x
  2. Step 2: Convert to fraction form
    704,981.45/972,601.91 = 398,987.70/x
  3. Step 3: Cross multiply
    704,981.45x = 972,601.91 × 398,987.70
  4. Step 4: Simplify right side
    704,981.45x = 388,056,197,184.82
  5. Step 5: Solve for x
    x = 388,056,197,184.82/704,981.45
  6. Step 6: Final answer
    x = 550,448.81

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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.