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Finding the Fourth Proportional to 210,534.88, 315,789.36 and 70,281.76

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Solution

The fourth proportional to 210,534.88, 315,789.36 and 70,281.76 is: 105,418.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,534.88 : 315,789.36 = 70,281.76 : x
  2. Step 2: Convert to fraction form
    210,534.88/315,789.36 = 70,281.76/x
  3. Step 3: Cross multiply
    210,534.88x = 315,789.36 × 70,281.76
  4. Step 4: Simplify right side
    210,534.88x = 22,194,232,010.07
  5. Step 5: Solve for x
    x = 22,194,232,010.07/210,534.88
  6. Step 6: Final answer
    x = 105,418.31

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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.