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Finding the Fourth Proportional to 518,830.90, 778,482.78 and 266,288.72

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Solution

The fourth proportional to 518,830.90, 778,482.78 and 266,288.72 is: 399,554.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,830.90 : 778,482.78 = 266,288.72 : x
  2. Step 2: Convert to fraction form
    518,830.90/778,482.78 = 266,288.72/x
  3. Step 3: Cross multiply
    518,830.90x = 778,482.78 × 266,288.72
  4. Step 4: Simplify right side
    518,830.90x = 207,301,183,028.24
  5. Step 5: Solve for x
    x = 207,301,183,028.24/518,830.90
  6. Step 6: Final answer
    x = 399,554.43

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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.