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Finding the Fourth Proportional to 718,697,492.93, 991,805,528.13 and 388,672,631.93

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Solution

The fourth proportional to 718,697,492.93, 991,805,528.13 and 388,672,631.93 is: 536,369,847.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,697,492.93 : 991,805,528.13 = 388,672,631.93 : x
  2. Step 2: Convert to fraction form
    718,697,492.93/991,805,528.13 = 388,672,631.93/x
  3. Step 3: Cross multiply
    718,697,492.93x = 991,805,528.13 × 388,672,631.93
  4. Step 4: Simplify right side
    718,697,492.93x = 385,487,664,981,010,752
  5. Step 5: Solve for x
    x = 385,487,664,981,010,752/718,697,492.93
  6. Step 6: Final answer
    x = 536,369,847.92

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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.