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Finding the Fourth Proportional to 210,311.80, 314,949.30 and 139,809.40

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Solution

The fourth proportional to 210,311.80, 314,949.30 and 139,809.40 is: 209,369.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,311.80 : 314,949.30 = 139,809.40 : x
  2. Step 2: Convert to fraction form
    210,311.80/314,949.30 = 139,809.40/x
  3. Step 3: Cross multiply
    210,311.80x = 314,949.30 × 139,809.40
  4. Step 4: Simplify right side
    210,311.80x = 44,032,872,663.42
  5. Step 5: Solve for x
    x = 44,032,872,663.42/210,311.80
  6. Step 6: Final answer
    x = 209,369.48

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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.