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Finding the Fourth Proportional to 391,866,035.32, 540,774,971.94 and 215,654,030.20

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Solution

The fourth proportional to 391,866,035.32, 540,774,971.94 and 215,654,030.20 is: 297,602,475.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,866,035.32 : 540,774,971.94 = 215,654,030.20 : x
  2. Step 2: Convert to fraction form
    391,866,035.32/540,774,971.94 = 215,654,030.20/x
  3. Step 3: Cross multiply
    391,866,035.32x = 540,774,971.94 × 215,654,030.20
  4. Step 4: Simplify right side
    391,866,035.32x = 116,620,302,130,152,912
  5. Step 5: Solve for x
    x = 116,620,302,130,152,912/391,866,035.32
  6. Step 6: Final answer
    x = 297,602,475.38

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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.