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Finding the Fourth Proportional to 720,648,167.76, 994,467,828.60 and 390,616,220.88

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Solution

The fourth proportional to 720,648,167.76, 994,467,828.60 and 390,616,220.88 is: 539,035,943.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,648,167.76 : 994,467,828.60 = 390,616,220.88 : x
  2. Step 2: Convert to fraction form
    720,648,167.76/994,467,828.60 = 390,616,220.88/x
  3. Step 3: Cross multiply
    720,648,167.76x = 994,467,828.60 × 390,616,220.88
  4. Step 4: Simplify right side
    720,648,167.76x = 388,455,264,994,471,616
  5. Step 5: Solve for x
    x = 388,455,264,994,471,616/720,648,167.76
  6. Step 6: Final answer
    x = 539,035,943.44

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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.