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Finding the Fourth Proportional to 390,987.63, 584,055.51 and 283,518.45

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Solution

The fourth proportional to 390,987.63, 584,055.51 and 283,518.45 is: 423,518.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,987.63 : 584,055.51 = 283,518.45 : x
  2. Step 2: Convert to fraction form
    390,987.63/584,055.51 = 283,518.45/x
  3. Step 3: Cross multiply
    390,987.63x = 584,055.51 × 283,518.45
  4. Step 4: Simplify right side
    390,987.63x = 165,590,512,909.16
  5. Step 5: Solve for x
    x = 165,590,512,909.16/390,987.63
  6. Step 6: Final answer
    x = 423,518.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.