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Finding the Fourth Proportional to 1,430.55, 1,973.43 and 840.47

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Solution

The fourth proportional to 1,430.55, 1,973.43 and 840.47 is: 1,159.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.55 : 1,973.43 = 840.47 : x
  2. Step 2: Convert to fraction form
    1,430.55/1,973.43 = 840.47/x
  3. Step 3: Cross multiply
    1,430.55x = 1,973.43 × 840.47
  4. Step 4: Simplify right side
    1,430.55x = 1,658,598.84
  5. Step 5: Solve for x
    x = 1,658,598.84/1,430.55
  6. Step 6: Final answer
    x = 1,159.41

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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.