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Finding the Fourth Proportional to 289,640.80, 434,266.80 and 139,952.80

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Solution

The fourth proportional to 289,640.80, 434,266.80 and 139,952.80 is: 209,835.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,640.80 : 434,266.80 = 139,952.80 : x
  2. Step 2: Convert to fraction form
    289,640.80/434,266.80 = 139,952.80/x
  3. Step 3: Cross multiply
    289,640.80x = 434,266.80 × 139,952.80
  4. Step 4: Simplify right side
    289,640.80x = 60,776,854,607.04
  5. Step 5: Solve for x
    x = 60,776,854,607.04/289,640.80
  6. Step 6: Final answer
    x = 209,835.27

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1.5x scale

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.