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Finding the Fourth Proportional to 287,935.79, 397,137.21 and 211,430.89

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Solution

The fourth proportional to 287,935.79, 397,137.21 and 211,430.89 is: 291,617.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,935.79 : 397,137.21 = 211,430.89 : x
  2. Step 2: Convert to fraction form
    287,935.79/397,137.21 = 211,430.89/x
  3. Step 3: Cross multiply
    287,935.79x = 397,137.21 × 211,430.89
  4. Step 4: Simplify right side
    287,935.79x = 83,967,071,776.73
  5. Step 5: Solve for x
    x = 83,967,071,776.73/287,935.79
  6. Step 6: Final answer
    x = 291,617.35

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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.