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Finding the Fourth Proportional to 718,730,425.72, 991,848,648.84 and 388,705,564.72

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Solution

The fourth proportional to 718,730,425.72, 991,848,648.84 and 388,705,564.72 is: 536,414,036.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,730,425.72 : 991,848,648.84 = 388,705,564.72 : x
  2. Step 2: Convert to fraction form
    718,730,425.72/991,848,648.84 = 388,705,564.72/x
  3. Step 3: Cross multiply
    718,730,425.72x = 991,848,648.84 × 388,705,564.72
  4. Step 4: Simplify right side
    718,730,425.72x = 385,537,089,164,121,216
  5. Step 5: Solve for x
    x = 385,537,089,164,121,216/718,730,425.72
  6. Step 6: Final answer
    x = 536,414,036.98

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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.