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Finding the Fourth Proportional to 718,730,420.72, 991,848,641.94 and 388,705,559.72

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Solution

The fourth proportional to 718,730,420.72, 991,848,641.94 and 388,705,559.72 is: 536,414,030.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,730,420.72 : 991,848,641.94 = 388,705,559.72 : x
  2. Step 2: Convert to fraction form
    718,730,420.72/991,848,641.94 = 388,705,559.72/x
  3. Step 3: Cross multiply
    718,730,420.72x = 991,848,641.94 × 388,705,559.72
  4. Step 4: Simplify right side
    718,730,420.72x = 385,537,081,522,809,600
  5. Step 5: Solve for x
    x = 385,537,081,522,809,600/718,730,420.72
  6. Step 6: Final answer
    x = 536,414,030.08

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1.5x scale

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.