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Finding the Fourth Proportional to 426,020, 638,669.04 and 285,348

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Solution

The fourth proportional to 426,020, 638,669.04 and 285,348 is: 427,780.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,020 : 638,669.04 = 285,348 : x
  2. Step 2: Convert to fraction form
    426,020/638,669.04 = 285,348/x
  3. Step 3: Cross multiply
    426,020x = 638,669.04 × 285,348
  4. Step 4: Simplify right side
    426,020x = 182,242,933,225.92
  5. Step 5: Solve for x
    x = 182,242,933,225.92/426,020
  6. Step 6: Final answer
    x = 427,780.23

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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.