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Finding the Fourth Proportional to 644,785.90, 889,763.72 and 358,288.90

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Solution

The fourth proportional to 644,785.90, 889,763.72 and 358,288.90 is: 494,416.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,785.90 : 889,763.72 = 358,288.90 : x
  2. Step 2: Convert to fraction form
    644,785.90/889,763.72 = 358,288.90/x
  3. Step 3: Cross multiply
    644,785.90x = 889,763.72 × 358,288.90
  4. Step 4: Simplify right side
    644,785.90x = 318,792,464,498.71
  5. Step 5: Solve for x
    x = 318,792,464,498.71/644,785.90
  6. Step 6: Final answer
    x = 494,416.00

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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.