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Finding the Fourth Proportional to 429,638,700.80, 644,458,051.20 and 386,640,531.20

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Solution

The fourth proportional to 429,638,700.80, 644,458,051.20 and 386,640,531.20 is: 579,960,796.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,638,700.80 : 644,458,051.20 = 386,640,531.20 : x
  2. Step 2: Convert to fraction form
    429,638,700.80/644,458,051.20 = 386,640,531.20/x
  3. Step 3: Cross multiply
    429,638,700.80x = 644,458,051.20 × 386,640,531.20
  4. Step 4: Simplify right side
    429,638,700.80x = 249,173,603,252,084,800
  5. Step 5: Solve for x
    x = 249,173,603,252,084,800/429,638,700.80
  6. Step 6: Final answer
    x = 579,960,796.80

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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.