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Finding the Fourth Proportional to 717,330,886.40, 989,886,037.86 and 399,774,234.74

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Solution

The fourth proportional to 717,330,886.40, 989,886,037.86 and 399,774,234.74 is: 551,671,398.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,330,886.40 : 989,886,037.86 = 399,774,234.74 : x
  2. Step 2: Convert to fraction form
    717,330,886.40/989,886,037.86 = 399,774,234.74/x
  3. Step 3: Cross multiply
    717,330,886.40x = 989,886,037.86 × 399,774,234.74
  4. Step 4: Simplify right side
    717,330,886.40x = 395,730,933,265,292,160
  5. Step 5: Solve for x
    x = 395,730,933,265,292,160/717,330,886.40
  6. Step 6: Final answer
    x = 551,671,398.47

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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.