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Finding the Fourth Proportional to 620,272,361.70, 930,408,542.55 and 390,689,849.70

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Solution

The fourth proportional to 620,272,361.70, 930,408,542.55 and 390,689,849.70 is: 586,034,774.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,272,361.70 : 930,408,542.55 = 390,689,849.70 : x
  2. Step 2: Convert to fraction form
    620,272,361.70/930,408,542.55 = 390,689,849.70/x
  3. Step 3: Cross multiply
    620,272,361.70x = 930,408,542.55 × 390,689,849.70
  4. Step 4: Simplify right side
    620,272,361.70x = 363,501,173,648,455,552
  5. Step 5: Solve for x
    x = 363,501,173,648,455,552/620,272,361.70
  6. Step 6: Final answer
    x = 586,034,774.55

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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.