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Finding the Fourth Proportional to 644,969.79, 890,038.65 and 369,318.69

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Solution

The fourth proportional to 644,969.79, 890,038.65 and 369,318.69 is: 509,648.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,969.79 : 890,038.65 = 369,318.69 : x
  2. Step 2: Convert to fraction form
    644,969.79/890,038.65 = 369,318.69/x
  3. Step 3: Cross multiply
    644,969.79x = 890,038.65 × 369,318.69
  4. Step 4: Simplify right side
    644,969.79x = 328,707,908,267.37
  5. Step 5: Solve for x
    x = 328,707,908,267.37/644,969.79
  6. Step 6: Final answer
    x = 509,648.53

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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.