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Finding the Fourth Proportional to 387,931.65, 535,682.07 and 286,133.55

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Solution

The fourth proportional to 387,931.65, 535,682.07 and 286,133.55 is: 395,112.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,931.65 : 535,682.07 = 286,133.55 : x
  2. Step 2: Convert to fraction form
    387,931.65/535,682.07 = 286,133.55/x
  3. Step 3: Cross multiply
    387,931.65x = 535,682.07 × 286,133.55
  4. Step 4: Simplify right side
    387,931.65x = 153,276,612,360.45
  5. Step 5: Solve for x
    x = 153,276,612,360.45/387,931.65
  6. Step 6: Final answer
    x = 395,112.42

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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.