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Finding the Fourth Proportional to 647,894,930.40, 971,927,643.60 and 239,238,136.80

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Solution

The fourth proportional to 647,894,930.40, 971,927,643.60 and 239,238,136.80 is: 358,888,683.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,894,930.40 : 971,927,643.60 = 239,238,136.80 : x
  2. Step 2: Convert to fraction form
    647,894,930.40/971,927,643.60 = 239,238,136.80/x
  3. Step 3: Cross multiply
    647,894,930.40x = 971,927,643.60 × 239,238,136.80
  4. Step 4: Simplify right side
    647,894,930.40x = 232,522,158,559,278,464
  5. Step 5: Solve for x
    x = 232,522,158,559,278,464/647,894,930.40
  6. Step 6: Final answer
    x = 358,888,683.41

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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.