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Finding the Fourth Proportional to 393,386.40, 542,779.92 and 223,607.16

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Solution

The fourth proportional to 393,386.40, 542,779.92 and 223,607.16 is: 308,524.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,386.40 : 542,779.92 = 223,607.16 : x
  2. Step 2: Convert to fraction form
    393,386.40/542,779.92 = 223,607.16/x
  3. Step 3: Cross multiply
    393,386.40x = 542,779.92 × 223,607.16
  4. Step 4: Simplify right side
    393,386.40x = 121,369,476,416.23
  5. Step 5: Solve for x
    x = 121,369,476,416.23/393,386.40
  6. Step 6: Final answer
    x = 308,524.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.