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Finding the Fourth Proportional to 213,990.48, 320,987.32 and 56,218.64

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Solution

The fourth proportional to 213,990.48, 320,987.32 and 56,218.64 is: 84,328.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,990.48 : 320,987.32 = 56,218.64 : x
  2. Step 2: Convert to fraction form
    213,990.48/320,987.32 = 56,218.64/x
  3. Step 3: Cross multiply
    213,990.48x = 320,987.32 × 56,218.64
  4. Step 4: Simplify right side
    213,990.48x = 18,045,470,587.64
  5. Step 5: Solve for x
    x = 18,045,470,587.64/213,990.48
  6. Step 6: Final answer
    x = 84,328.38

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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.