Home / 518,721.45-715,821.35-289,285.71

Finding the Fourth Proportional to 518,721.45, 715,821.35 and 289,285.71

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Solution

The fourth proportional to 518,721.45, 715,821.35 and 289,285.71 is: 399,206.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,721.45 : 715,821.35 = 289,285.71 : x
  2. Step 2: Convert to fraction form
    518,721.45/715,821.35 = 289,285.71/x
  3. Step 3: Cross multiply
    518,721.45x = 715,821.35 × 289,285.71
  4. Step 4: Simplify right side
    518,721.45x = 207,076,886,021.48
  5. Step 5: Solve for x
    x = 207,076,886,021.48/518,721.45
  6. Step 6: Final answer
    x = 399,206.33

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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.