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Finding the Fourth Proportional to 210,011.80, 315,017.70 and 121,438.30

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Solution

The fourth proportional to 210,011.80, 315,017.70 and 121,438.30 is: 182,157.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,011.80 : 315,017.70 = 121,438.30 : x
  2. Step 2: Convert to fraction form
    210,011.80/315,017.70 = 121,438.30/x
  3. Step 3: Cross multiply
    210,011.80x = 315,017.70 × 121,438.30
  4. Step 4: Simplify right side
    210,011.80x = 38,255,213,957.91
  5. Step 5: Solve for x
    x = 38,255,213,957.91/210,011.80
  6. Step 6: Final answer
    x = 182,157.45

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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.