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Finding the Fourth Proportional to 489,878.70, 675,985.95 and 274,969.50

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Solution

The fourth proportional to 489,878.70, 675,985.95 and 274,969.50 is: 379,431.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,878.70 : 675,985.95 = 274,969.50 : x
  2. Step 2: Convert to fraction form
    489,878.70/675,985.95 = 274,969.50/x
  3. Step 3: Cross multiply
    489,878.70x = 675,985.95 × 274,969.50
  4. Step 4: Simplify right side
    489,878.70x = 185,875,518,678.53
  5. Step 5: Solve for x
    x = 185,875,518,678.53/489,878.70
  6. Step 6: Final answer
    x = 379,431.72

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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.