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Finding the Fourth Proportional to 287,971,461.53, 397,397,783.76 and 155,809,557.08

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Solution

The fourth proportional to 287,971,461.53, 397,397,783.76 and 155,809,557.08 is: 215,015,655.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,971,461.53 : 397,397,783.76 = 155,809,557.08 : x
  2. Step 2: Convert to fraction form
    287,971,461.53/397,397,783.76 = 155,809,557.08/x
  3. Step 3: Cross multiply
    287,971,461.53x = 397,397,783.76 × 155,809,557.08
  4. Step 4: Simplify right side
    287,971,461.53x = 61,918,372,670,232,224
  5. Step 5: Solve for x
    x = 61,918,372,670,232,224/287,971,461.53
  6. Step 6: Final answer
    x = 215,015,655.87

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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.